Bioceramic: Resorbable bioceramics such as hydroxyapatite and beta tri-calcium phosphate have been used in the treatment of bony deficit for many years. For example, ChronOS (Synthes GmbH, Oberdorf) bone graft substitute is a fully synthetic and resorbable bone graft substitute consisting of beta-tricalcium phosphate with a compressive strength similar to that of cancellous bone. The interconnected porosity acts as an osteconductive matrix for the ingrowth of bone cells and blood vessels. Such materials are used for filling of bone defects after trauma, reconstruction or correction in non-load bearing indications and commonly these materials prescribe a method of perfusion of the granules in the operating room with the patient's own bone marrow. Resorption of the bioceramics has been shown to occur over a period of 6-18 months (Buser 1998).